Pre-emergent herbicides prevent seeds from germinating, protecting properties from weeds long before they become a threat. Choosing a pre-emergent is a very important decision, so here are nine considerations to keep in mind when picking a product.
1. Identify Target Weeds
Start by determining which weeds are likely to cause problems on the properties you treat. The answer is probably, “A lot.” The best course of action is to choose a broad-spectrum pre-emergent herbicide.
A product like Dimension 2EW (24% dithiopyr), for instance, offers excellent pre-emergent control of crabgrass and 47 other grassy and broadleaf weeds. Products containing prodiamine, like Kade 4L and Coastal (for warm-season turf only), are effective on a wide range of weeds, too.
2. Time Applications Properly
Apply pre-emergents before weed seeds germinate. Timing for springtime weeds will vary based on your geographic location. In the North and transition zone, most applications occur in early spring. In the South, applications usually take place in late winter or early spring. To prevent winter weeds, apply pre-emergents in the fall to keep them from germinating.
Consider split applications to extend control. Also, if you plan to overseed or reseed, delay herbicide use to avoid inhibiting seed germination. One way around this is by using a starter fertilizer with mesotrione.
3. Consider the Mode of Action
Using herbicides with different modes of action prevents resistance. Consider buying several different pre-emergent herbicides, each with a different FRAC code, and rotating them.
4. Keep Soil Conditions in Mind
Check the label to make sure your pre-emergent herbicide can be used on your soil type. For example, some herbicides shouldn’t be used on sandy or coarse soils because they can move down into the root zone. This can significantly damage or kill the turf.
5. Check Tolerance
Check the product label to ensure the pre-emergent herbicide you’ve selected is safe for the turfgrass and ornamentals you’re treating. Misapplication can kill non-tolerant species.
6. Check Watering Requirements
Most pre-emergent herbicides need to be watered in after application. Plan applications around rainfall or schedule irrigation to make sure your pre-emergent works properly.
7. Look at the Duration of Activity
Some pre-emergent herbicides provide extended control lasting several months, reducing the need for frequent applications, while others last a matter of weeks. Check your product of choice’s label for residual information. Keep in mind that just because a product has a shorter residual doesn’t necessarily mean it’s a bad choice.
8. Follow Label Instructions When Applying
Herbicides shouldn’t be applied during windy conditions, as drift can occur. Herbicides also shouldn’t be used near sensitive areas like bodies of water. The safety data sheet (SDS) will mention what organisms, such as fish, can be harmed by the product if used improperly. Always follow label instructions to protect yourself, others, and the environment.
9. Check Your Budget and Storage Space
Make sure the products you’ve selected line up with your budget and can be stored properly. Your storage area should be kept cool and dry to keep your herbicides safe and effective.
With the right pre-emergent herbicides, you’ll be able to successfully keep weeds at bay in the new year. For product suggestions and advice tailored to your needs, reach out to your ATS rep. If you’re new to ATS, find a rep here.
